SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b69e132db115a4260ba8142a8216e98b41d95897fb64053c58dc930190dd51' 
  AND token = '95ShsWBZY7PwAHLUrDDbgEhOAZ7yB3RwMRsqPWzxSxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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