Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a16ed8352bc2367911a72e46d39745f11ad694187f9003dc0d551df2313b08fa' 
  AND token = '9H4GcfTR8LtaFJO4rvxDq87UI73drIWHXA9gR/McUso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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