That's about 2.5 million records maximum per year. I'd go with the suggestion of Yosiasz and use one table.
With your current setup, I don't expect you to query the log of the last month frequently. Keeping the size of the table low to speed up queries.
If you did, you would most likely have chosen for a sliding window, a table that just hold the logs of the last X days, say 30 days.
Is there a need to keep logs that are older than one year?
If not, I'd go with two tables: log_last_30_days and log_last_year.
In a scheduled job, that runs daily, you copy/move all the records from the Log table to log_last_30_days and to the log_last_year tables.
Then delete all records from the log_last_30_days table that are older than 30 days.
Then delete all records from the log_last_year table that are older than 365 days.
If you rarely ever query the log data, you may skip the small log_last_30_days table and only use the log_last_year table.