SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c37c3a660ea2af7634c3b1e37a69f6c1175036042b685813f6a8ee3cfbdb574b' 
  AND token = 'jFQXgzu9HbTKrJh938Cez0c2HPKMaEZj+vhngXUX0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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