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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9af7f03869a748a99b346397d6b37089d142b8011ee25cf75c34ebbaa720e30' 
  AND token = '3yCVcVgaujIhMWAL7+AKOcrGM9eXykGVHtsdU4PUBKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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