SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff80d7329692e5fc87d31af6f81e54b3e14b2a80b64e139965e7a00a41218472' 
  AND token = 'q042Gu58cK+yPJmehRYmWQxiAowrZP7AlcpNWqsfcG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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