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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf958d48bec8edadde6056fd73e920f6361083cd294db9cb23dcc3f78e1e0bb4' 
  AND token = 'PcZP0TbywTghwTMYvCOZmEqgWAmi06WZ8wDjHKFeJp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}