SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b59ec7f7137e3f3423afd91894ebe05be3fa65600055a2c8af2708f7fb81144f' 
  AND token = '7OnOcn6LIOQYnCcJwphbkj0Zq9Ysdb427v8gnmwv6j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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