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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d88a2274a6892d68f03cdc196a49a651ebe5f26baa860cf9847c5c598280b70' 
  AND token = 'QNs1nmqj4ORwsUeuvT51IRjzdrf01kxWgw2s0U6/Exw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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