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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cbd800ac9527cdc37a3b2b553c7d98180d33d6d2f4afbf993c7eaaa81f3370b' 
  AND token = 'MP9wPRYEdVv7dxehjen7A4VJP44b2Le6Myt0yr0kreQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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