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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '876809a0dceac49d2705f6a7c839dd55de3f8a7dab63aaaf023e40365c27e2c1' 
  AND token = 'vSi2l3kuedISDk8/mBqB+bNNQCuYBps2f9StZMsQO9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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