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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86eebe40eac92d3c9b4f22af9c9d0c31f95dd16087469fc5e76b13238b186d33' 
  AND token = 'IQanbEQX5LPOgk80bRzgUuW1OZ8vMLg7bFMyZgFUgac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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