AWS Identity and Access Management (IAM) now provides action last accessed information for more than 140 services to help you refine the permissions of your IAM roles. You can review action last accessed information, identify unused permissions, and refine to scope down the access of your IAM roles to only the actions that they use for services such as Amazon CloudWatch, AWS Key Management Service (AWS KMS), and Elastic Load Balancing (ELB).
Source:: Amazon AWS