SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43af4b8a8ae710a21258d8dff45576ebc84a4653896d6ffac9cb8ac5e1ec6767' 
  AND token = 'hMdwnXEuCa1KvoZS8/OLFCw9GVQJ6Fe2WP3fY/16IJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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