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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bd16fd75b5dcf8246c3acb9efebf2e122a666ca2b79d7ccd485974a81f5e72b' 
  AND token = 'qMn8WmUeRnMb9ryZMQOZfpNltgksD6k+XT1JutAJj/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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