SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '089af7fd5e87290e6b1e70c4688a14849fc54a0904196ac6533a393d318bd867' 
  AND token = 'IXo93s3oL8F3bxA4lUV/q0m+sjgbVCH2xchr0iZJzRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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