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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d29091d5256fe83ec3e8c016e6579d2ab412f15fc0c1b8e87d445dd104e4c7b' 
  AND token = '+CFeZSk8tJCX79jX9J0cobf94zU1zxh8ti13ujQTMNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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