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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2aac3cda0ffb98b01f1cec7be74dbc4a531efeff29028193f62eb78dad29f880' 
  AND token = 'Yp1kC+lCg0agzhKV1l17oayB5A1yc8Z7p11Zn/29/fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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