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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4826e8df9387433485bfb99c8f2a478758a62dba0a4f867b99d83cb461a87b07' 
  AND token = '9BXb0vjO72w3lUyR6MAR7388n7omYaY/ZCmFW3tg/B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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