SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dcf1189090c5e399760e2d224fb3a25dc3c75871a80476701b43f49fcc077cb' 
  AND token = 'KFlTsIlDkUak1dhRH5rQZsHoNurMIFPsQVqrmj5mP8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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