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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b117bafcdc18e5668467fa4884e4c57a3bc2a8630a55e61e66b90a79c83aea2' 
  AND token = 'Byyzg3kfXQn++MupGmn8ePL7Y/GdTx8fxmSwXBXopwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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