Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c641c0e1d0f57c1966f42accf90e7e0c8fb97170b96f8b03bf501209236cd62' 
  AND token = 'cjZMhloigYckd1cPlI5tRMdiDjcEjy4xLyeBV0Am8+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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