SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e60458b594d7d28edd2f1da3b5eb8a6f039ffecfb06f7b520097665cfed29359' 
  AND token = 'KBAbLW8OJkWgGj0QH3+q85QMSD+cgZB2rqGf1BmV/Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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