SlimStat country code query examines 128924 rows

This morning GoDaddy shut down my blog because it was, apparently, overloading their server.
The message I got from them includes the following information about the issue:

SELECT country_code
FROM wp_slim_countries
WHERE ip_from <= 3497226051 AND ip_to >= 3497226051
LIMIT 1

EXPLAIN:
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE wp_slim_countries range ip_from_idx ip_from_idx 5 128924 Using where

This query examines 128924 rows,

This looks to me like SlimSat if the plugin causing the problem. Is there anything I can do to fix this? I love this plugin.