SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4c1b6765bcf9ecc2deeb62096e60d302b57dc340d642340db81c35b9c00f808' 
  AND token = 'ZihNtXOIzD8AMrTMGksHrEKHg+1d7LkDJ6UvBnBGP5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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