SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f389772cef31a720d15f4b80989a61c94ca1d2d70783fba5076f8936ead8a64b' 
  AND token = 'RqV9bLgxzc3R+jd1KzBgJgUE/0IypA+u4c5b/+mra+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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