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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc9b6fb7b5a43fbcc9913921324924c0618cb3ee399761a4d84d1062e67c542f' 
  AND token = 'U6UMmSuKj4MKaxPRJLoAXNjkxx3HJYndOVRQ+cV+o3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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