SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25c30169278477714972a8ddc3da35e22da1b58404e54d334eb7156cc37df3b3' 
  AND token = 'EzvYyslOFKt+zELYd6+xCOKXlR2YqNuGobMluPzkPLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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