SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2adffc2273c27084e9593e0b8b2004961a608237e6310fcf168ee4115fd0f45c' 
  AND token = 'gLJsQ22UlsRgzHlsSmnhaGkFpWM3KZjwN37Kk/sQ7dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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