ffmpeg – How to move all video files with mp3 audio?

My folder has some video files with mp3 audio and some video files with aac audio. I want to move all files which have mp3 audio to another folder. When I asked my friend, he gave me this script:

mp3ToAAC.sh

#To convert mp3 audio to AAC
for file in *;
do
    if [ $file == "mp3ToAAC.sh" ]; then
        continue;
    fi
    if [ -f "$file" ]; then
        ffmpeg -i "$file" -acodec aac -vcodec copy ../"$file"
    fi 
done

That will convert all video files with audio mp3 to aac. Before using this, I want to move the files which have mp3 audio to another directory. I want to run this script only on those files. How to do that?