OK, so now you know that men cannot be tested for HPV except for a biopsy of genital warts. And now you know that he had genital warts on his scrotum and should not have had sex with you or anyone.
The presence of visible warts on his scrotum made the sex he had with you high risk but do realize that people are passing the virus to each other via invisible warts. Condoms do not cover a scrotum, thighs, buttocks, pubic area or the base of the penis. The 3 minute unsafe sex was not a good idea anyway. Usually during sex, a man's scrotum gets rubbed with a woman so it is possible he spread it to you. But not very likely since it was a one time encounter.
Average time to show warts is 2-8 months past the encounter. Women can get tested for HPV. No visible warts at 3 months is good but you should consider getting tested by the 6-8 month past the encounter point. The odds are good that you didn't get infected since it was a one time event by not zero.