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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9793e8ae1e2ab65c0e0d75c8c7a0fa407cd24300917225db81dcf8db99b82ddd' 
  AND token = 'RI4eMHkXN1WH3AYETKcz/wK8LVA6r0DoBX4ze8qYmng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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