SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0ad8ba003985bad3b0906dc4a06cf8d5a8dbfe13147e56f7d8b563c203b366e' 
  AND token = 'prfsq52yiWoTm6hjJD0gQPwzGjdTW5AYuQUJDGAYvlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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