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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ad28f0f1350dc725efdbe156d6e10b6bf0ba8992fe074fa7129561aad1c7d59' 
  AND token = '5heVKNTxd/nrHQHjuJ4wsXNMopNQEloIsaNK/VD/qBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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