The unreal indicative with or without ἄν may be used as the apodosis of
a. εἰ with the indicative in Simple Present and Past conditions ( cross2300 b). So after εἰ with the future denoting present intention or necessity that something shall be done ( cross2301), as εἰ γὰρ γυναῖκες εἰς τόδ' ἥξουσιν θράσους . . ., παρ' οὐδὲν
αὐταῖς ἦν ἂν ὀλλύναι πόσεις
b. εἰ with the past indicative in Present and Past Unreal conditions ( cross2302).
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].