SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95531e5c03f5fe534d56efed628f173a7946d2f4666e6d4d83d0cb565490de61' 
  AND token = '+l8JmVrx5vn4xo5LcBb/z7rwZuZfsl+3j/Sfi1uNZaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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