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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ec6331bfe5b98ad354acf4266446c60ec6d13058138a5bf66d43c37bcf270ef' 
  AND token = 'DHAYummr70zi0AhIWyrl9qstZZh8kEBMhYBhdLVoxLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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