SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '982cf1c2d31d02416ca6d67a46109635dfd04297f6db536bc8fa04e8e6219a48' 
  AND token = 'jTtasEpaCK2VglckKbc/xSSkBK0ZPoJvSZjp3JHIOgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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