SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24569208af6ae6bf1ff5a879f8df224e2cca081360ea23454b8f3e8f597c7a15' 
  AND token = 'nPwurJVs4r6WOIMNJHq3FgPD9mqsOhNxLjszSnVqymg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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