SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '560de62d2ff75a13651d90abfbf2b89da7cc8e080365c1cef90d7f0728eb1df9' 
  AND token = 'pQG/piL5SZHhg4aa6KZ78YQ1jzDkSh1iJ41ITV3ngFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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