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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0d7f2dba08682340e3ab171e447b1a50c46f0cea5756932d5de9c0eafa09a53' 
  AND token = 'XKRRR7QxN+4yiZeEzNk+G16xB014IJr8vOy4BqKLVV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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