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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33fcc2bca971b17287f025b6501db46e360613bf924decb25fd349b87aea46a6' 
  AND token = '2uZZ1W19KttAIHevRlF8HZclZ39Z8QLlc4nqWvhRCRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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