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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f1c839fbc77e119662a5a84fb29f55d203d08869c2f3b9eb03a81316ad67fbb' 
  AND token = '2Pj64ntbEdOpNHn2JRgCSgeYDsW2Dft2Mxb/9SxsxFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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