SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e656a967d8cfb47dc76d77b678d134b39398c6adcd886b0a0f24035ed7444d6a' 
  AND token = '87AkXgwVPwz9IsvuwSqZJM8N71qfRh/iN5xG5pMLnlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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