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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '684fe3d07275dbca8beea5ecf6e056af19b8405dbdca819f5134f29221000475' 
  AND token = 'p2/0anhoPglwWyWxI+kx+lIAP5B89BWlU+/sHaQr5eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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