SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecf048b2067477a7ed494c037600ba79b54d33657f8f43a66f2b06303c81bdac' 
  AND token = 'UhzwhP7Mnz4v5QpByT7KzJslrsqXfKaR1vn2r0LmK7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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