SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cfb64dde1dc3f6bf37f15ab86f7076f62531a4a9ca50c6f9264616076309a4c' 
  AND token = 'HMHniAcuIBv5AgZubJuQJU8HDQ7ihF47/j1Y2E04ykY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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