Add `used` scope to access token

app/lib/access_token_extension.rb

@@ -13,6 +13,7 @@ module AccessTokenExtension
     scope :expired, -> { where.not(expires_in: nil).where('created_at + MAKE_INTERVAL(secs => expires_in) < NOW()') }
     scope :not_revoked, -> { where(revoked_at: nil) }
     scope :revoked, -> { where.not(revoked_at: nil).where(revoked_at: ...Time.now.utc) }
+    scope :used, -> { where.not(last_used_at: nil) }
   end
 
   def revoke(clock = Time)

app/models/user.rb

@@ -283,7 +283,7 @@ class User < ApplicationRecord
   def applications_last_used
     Doorkeeper::AccessToken
       .where(resource_owner_id: id)
-      .where.not(last_used_at: nil)
+      .used
       .group(:application_id)
       .maximum(:last_used_at)
       .to_h