SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a95ba63368e3d56f218ceedde17afac588de775b68d47ff70813c453fb0ae046' 
  AND token = '/Fw49bG3/9ekPgP+KOW9lw+AgV1Oz0jGyGoPXIrzITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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