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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dd3a787ddf1e5ce44c6f91a21f248aafa6d2ad3d47962507bb40a01bb2d9b38' 
  AND token = 'un+laTza9uoSdrYra4hsaxUqDYG9XAT4e77L/TbwrW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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