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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9328a35b39fd1e40fae450ea5423ff8f9422daabe5f010e4b6ee40ba6242a6a1' 
  AND token = 'vHwaG8ib9/QllrsaufioYHD0vu14Kz7UFj82fkHL5qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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