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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '491afd2aa79b85c5962c537c3a9fa19dcea89ba10860b6052f77d6325f03a8b9' 
  AND token = 'RgQY1qLz3irEbgfHadHvQ1JlV1QJiJnJYhtooVg2tAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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