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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '826835c6c7492cb88dca5baf54fda60f37f58332f7cee39f4de90e77636b2428' 
  AND token = 'WKJden8TKcLoCSMtF7vASmbb8meMQvkr7nwQy9pSkX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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