SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59d36244ba434f607c69f57f21d98ca9d0d16d1bf6f32d0cecfdeadbdafb7d35' 
  AND token = '57jIGiNgc6T2UDrFdCZnk5Hu7B83/7JajLWVBYc9Fm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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