SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36a0e9b23abbb1cfc0a1761c92c68f782b79ca827fc2a30924672e973d7ea36c' 
  AND token = 'YVzVfaOVphfpen+dMZDfXdP+GBxBvUQGzUXP5N7GshA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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