SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30ebd0f4c52128ef589bbf6912256b431ae8aeb541d840418d10a5730a5dfef5' 
  AND token = '+bWY/mTFKJCnnZZaajr+WlKf+v3TY3XIJOmaP+fw0eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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