SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d79ae20fc9ea9663a024f0af5f954aab18a99b55089b857347ad325795f0263' 
  AND token = 'lzGe2Qov8mWYvvz3O+7/20Zz+H9AA2WtvjeMq/0pgwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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