SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78d0b1fbc4fb5bc677c93f058d90af5bd2aa1cb1461d5a37848302a66638b3ed' 
  AND token = 'EzBQIvv0+a0iUIXzlLtpNqavAX4CYHc+Mt1zB2cwK9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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