SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a281eabe57b7e61ad208c928920e19930946723a66e65d7549516040dd7e056' 
  AND token = 'ZT7vwaff7Y4jZeo9hA9UXXHouVg80JS9LI3KjfRHV8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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