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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08a61f62fcb19a57b0356f6f6c8173e365ca6cdc8ee876515b116279e812f471' 
  AND token = 'TWL48FZT61WgbxWBY/isKPMS4mu63jgavw6Y84vImSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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