SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0f6e8453543eee77619a96c69bd6d8f5186422261de1c211370874307379934' 
  AND token = 'PXVc1vahfQOnjPuUkSik/MxNZt1C6V0W4FcoJegHbLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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