SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da2b42a94a3fcd925fb16bc9348a31b0c6d4cc0c29f4960d1cbbad00d1332ae5' 
  AND token = 'XEAhXzHGzHUhl10zrb+NAuR8/FBkz/QwGvVZw6yCMeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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