SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83ee239d9b7e2dc288555a9ced655ffebf555b9325da000175b4900f468176ca' 
  AND token = 'N8+OzKczadPg3D6CdOZF4k8VDT7J0OjCXzwJPxSlwLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}