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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13f6394523767c6ed8e4978140ee92f7391702ca3f210950215d30b5442b7f3d' 
  AND token = 'tzn8Uw0ybGO7F8zMSbppKAIq80BTepPYoopa7liyUAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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