SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe3902b887ab7ae627daf43d3fd1dd2415d5c6a934500646045ceacdc41702d4' 
  AND token = 'j89GxnZcA4XgJ5L2eUE8s/umu0wqcGJU/ezPQdDKKbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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