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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59764930bc49d7c3bb2f0634a3ea914f9e48a868c29a82ef50cfbc140f5c7310' 
  AND token = 'JDrhNPzhWq4ZXxaRXMi92BSEy7k1ujoO1ZBtyVNiyow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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