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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bb906c22dff4ee236ec0ee3ea7dce00e56526b7fd1b9235ea417795341f36cf' 
  AND token = 'f2qrDzdaPLyc4QSnCHdpbi0q5Dmoiru2JREmBZa6Mz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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