SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45a195ef94de684d29dc4f912ae447ebb0e1bd0c1145a56f740025914e37c8d3' 
  AND token = 'G4tj5oX6YaM6pZfWGQXIhZ+4W+R2VDGWlcn3npg8zBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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