SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4716cefc9e3b2d8d8e2a8168ba920892be4adec8acc4713b7813fdb6253f88c' 
  AND token = 'rlWp/OB7kT5jETWPnEHJUTsvE+AnRhrNpqYXllXKKVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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