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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad17fed636c6a4224c6d0cfd653613af637fcdc4a60f8f9a40e0dc928e543bad' 
  AND token = '3Dznmqt4kwgTIgabcxDnpOgJ4ggH05aPBAhIQq4phHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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