SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a02f595bda3d2114cc42f19f66f76849821c06da868f94f31fc9f361adb99c90' 
  AND token = 'uWnAqExpPc16GpC0vIxaWYPJHjxBh+DVI2DWL9Amb8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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