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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98eba75c780cadac42160d70697cc51bf7433129ba28ed077bcf7949c6b933d9' 
  AND token = 'tDsGty28cPZVR9WudPfBPDM/UdBM+PqOKDiR6qwtQrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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