SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07f7fc502980a968c048214cf4c3ae40f15d8d7df2245b1b942bccde071e083c' 
  AND token = 'BKwhu+i4+gJDrPORs9eMvChpIwhyk4QGMINYDaPB5Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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