SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09c2ca7745954fd567ef673f3f96b8faf09aadf57c188abd926ce602010d5b60' 
  AND token = 'K9a+qUG15UpvdylWSz2vYbUYPZDc5aLOn9qJqwqcdTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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