Cron seems to be the wrong place. On debian based systems, use this more elegant hack:
/etc/rc.local (before the ‘exit 0’ line!)
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
nohup ./plexdrive-linux-amd64 -v 3 -o allow_other,read_only -t /data/tmp --clear-chunk-max-size=100G --clear-chunk-age=24h --chunk-size=30M /mnt/gdrive02-crypt &
exit 0
or go the most elegant and correct way, using a systemd service: