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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '519fe224701de985796a486d88ac5730f3ebb5f48b703fa85f8911cfc741b8ab' 
  AND token = 'nNaWKtrsU+VpRYFwanULK1sO0ABVaL1r619Qriko9LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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