Zone experience modifier is in the table 'zone', column called "zone_exp_multiplier". 1.00 means standard, going under 1.00 means you get less exp per kill, going over 1.00 means you get more exp per kill.
Character experience is in the table 'rule_values'. There are multiple rules that govern this so you may need to do some exploring (normal exp, AA, exp multipliers for red/yellow/white con etc.). If you just want a quick and simple modifier you can use the rule Character:ExpMultiplier.
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