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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad2828af148c0c5693e15706d2c9d11c10a8f35c41cc760958c646ba7bb836b7' 
  AND token = 'OGXSerL5jNPf2DBwnVXMptSrZGtnShp98hiEsvZ1f1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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