SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c6370d1b9f67ffd6717303ce803730d870efdaef31061155a6b4e1340779a9f' 
  AND token = '6wvuUJebVW+xRNHBglzoah4Fc4e/kVRWUgjJuPlbp1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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