SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '661df96ea3be3fc45b0d9e848dd3f3d71e74b99d47051a896f45ae9c0db27884' 
  AND token = 'hRCltJEsk3uOKNWTwwY7rWrPxq5vGLA7oST/pr1oFGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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