No.
I mean stuff like using aggregation functions to let the database build a bitset out of them, and reading from every row a value into that bitset.
I mean stuff like CLUSTER table ON (pixel_y_index, pixel, x_index) to change the order in which they are stored.
Do those two optimizations alone and you improve speed massively.
Misrepresentation; then it's not actually over 120 million rows. You're basically encoding which subset to actually search in the query, rather than building a proper overall schema that trivializes queries.