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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a866ad9b386bb93dff727d8f53b9a1f28d318e3c14b367e1ea83b522322de8f' 
  AND token = 'PjHMWiImfy645FcPl8ubMkkXRa57b9R3nXYgGJrAzww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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