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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3ec32c42633bf9ff93aa54f76c65b2f5e5c6005de4ea3696b29110df7a6b872' 
  AND token = '7R4BQhlrrqiWjWXandTyihGmqKs5rt0mhPWxi0Tvi4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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