SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b688211a8ee75a43cf3e90590efc34437aef07c4e6cd615868534c813f49d98' 
  AND token = 'Q9vI/ZVG25v9Opmz6RnIB/SkoghZpz09kjw/TL6nylQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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