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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60b6c3f6609f7914843fe5e902ae7c4acb4b4fba263e5bf4398f2e7921926f92' 
  AND token = 'K99m3ODFIJ4VJUrToW7i+mvXFuU3BOoAoiCVvJfTfSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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