SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cd3ce7665f246a74a26c61daa0f3f6c73948de99934eb84f941e630006028ce' 
  AND token = 'lP2Zt2UhwEKvn3drGqg2kzKTLzhdHpy9Xe1EbgjDVkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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