SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4aaa5b4d74e67ecab3a7218b5f4a3d15484356d07a14c6559c127381008ef94' 
  AND token = 'PBkEAo0mCzJxNPFS7hDZoqoIHfIJ+OgpmgPDkBpLI60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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