Enable to reuse_access_toke

lib/doorkeeper-mongodb/mixins/mongoid/access_token_mixin.rb

@@ -113,8 +113,9 @@ def by_previous_refresh_token(previous_refresh_token)
           # @return [Doorkeeper::AccessToken, nil] Access Token instance or
           #   nil if matching record was not found
           #
-          def matching_token_for(application, resource_owner, scopes)
+          def matching_token_for(application, resource_owner, scopes, include_expired: true)
             tokens = authorized_tokens_for(application&.id, resource_owner)
+            tokens = tokens.not_expired unless include_expired
             find_matching_token(tokens, application, scopes)
           end
 
@@ -425,6 +426,30 @@ def token_generator
         rescue NameError
           raise Doorkeeper::Errors::TokenGeneratorNotFound, "#{generator_name} not found"
         end
+
+        # Returns non-expired and non-revoked access tokens
+        def not_expired
+          relation = where(revoked_at: nil)
+
+          relation.where(
+            {
+              '$expr': {
+                '$gt': [
+                  {
+                    '$dateAdd': {
+                      startDate: '$created_at',
+                      unit: 'second',
+                      amount: '$expires_in',
+                    },
+                  },
+                  Time.now.utc,
+                ],
+              },
+            }
+          ).or(
+            relation.where(expires_in: nil)
+          )
+        end
       end
     end
   end