SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea2b4c14b7ac6f6750c664b7f53b3397f089d2a947dfd6dacb002e048c81a898' 
  AND token = 'Hw+qxVmtSyX6Th9sOq/6gKtBW2eyjVc2qPCwTjXIBUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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