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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbfecf15d799efb8031c86ef7eb95223ac9e6f7fb4042289a3d1e33306900a08' 
  AND token = '/X9pFHWXeT/6ESaQO/5aZmM1xxW9tTqE77oc6F/eZgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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