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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4601d5a35395ed6d3849694fcbac8a4197e7d938e337c4de5b52fbe53093f49b' 
  AND token = 'vY4IIM1ebBxjDvdMMdYnurKAu5N6beh4hnFGk0VlGB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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