SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '150bc7ca2c267322d9ded543543a6ed59a698fca7f144ea94ad819141229388b' 
  AND token = 'j/67uvuw2ukskAUbDBXWHvtVWuPd+bNIZaqtqYbmj9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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