SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcd352a14458133177b1374e22872ce475af1cc1563e2dcdae0509ed140c2ceb' 
  AND token = 'Ysmn3FYfEwgpOorxK19jvGHlJIxtbYwUX8oggImBgG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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