SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '610c91329b132ca8ab04eb1c6250e3fea458fd936017fcc692c5dc6d97b67274' 
  AND token = '/D4znlWMR75xpixLVMZS+9Rj+vNYTFHDB5Xczhy3OT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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