SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68432f5b161c1661659dde16fdbe1393965976f7ff7236e8c0ee2abda4b40c82' 
  AND token = 'dFWtHC1jWwUvKABpgOS8/ZIpx/XBEE3J+fMY55TwtZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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