Indexes are not working after restoring dump

[Amit K]

I had situation where DB was deleted accidently and have to restore using the mysql dump that I took previous day.
After the restoration the application performance seem to be slow and queries are taking longer than usual.

I do see the indexes defined, but they are not applied while executing queries.
Then I tried to run explain on the queries and I found
Possible_keys / Key / key_len/ ref are null and its scanning all the rows in the tables with where condition.

I tired repair table but it doesn't seem to help.

Did anyone face similar issue, please help me to fix this.

Thanks in advance
Amit